v. The act of defecating in one's partner's oral cavity. The defecating party then proceeds to insert their Penis* into the partners oral cavity in a swirling motion as to reproduce the cyclic motion of a blender.
*If the defecating party lacks a penis or similar penetrating organ, a similar straight, firm object will suffice.
I gave my girlfriend a Harlem Blender last night and now my dick stinks to all hell and I'm afraid to kiss her.
It's always best to give your girlfriend a Harlem Blender before you break up with her.
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